I don't anything about this shock wave theory.
Water may have been brought to the early Earth by comets---a hard rain fell.
The image provides some idea of what the planet formation period looked like.
Credit/Permission:
William K. Hartmann (1939--),
NASA,
before or circa 2008
(uploaded to Wikipedia
by User:Qbek,
2008 /
Public domain.
Image link: Wikipedia.
Local file: local link: protoplanetary_disk_solar.html.
File: Solar system file:
protoplanetary_disk_solar.html.